An alternative to key rings that cut into your fingers when pulling the Para 550 cord(s) tight is truck size lug nuts, or hexagon bolt nuts from any hardware store, or department like a Home Depot.
A pair, one for each end of doubled up para cord:
About, or at least an outside diameter of approximately one, and a half inches each, inside thread diameter of about one-inch, and width of about three quarters of an inch.
It’s easier to handle than key rings.
With the cord between your index, and middle fingers, you can close your whole fist around each nut, one in each hand to tighten up both ends of the para cord.
Or, swing one independently, holding the other one.
Either nut can be swung on one end of the cord to strike your opponent:
Cracking a jaw, up side his head, in his ribs, on a shin, anywhere you want to break a bone.
Also, as an emergency extraction tool to break auto glass; not just side windows but, also windshields.
What it won’t shatter outright, it will make a hole like a 12 Gauge rifled deer slug would.
Very effective on both.
Say a knife welder: Strike the knife hand, arm, or collarbone, breaking any.
If you break a collarbone, it’s arm becomes useless, as your opponent will actuate excruciating pain attempting any movement, and that arm will be lacking mechanical lift, or support to have any strength to do anything.
Whip it at his eyes, face, his package nuts, whatever you can strike, and hit will effect, extreme pain, and damage.
And, you won’t be punishing your knuckles, or breaking your hands with “boxer’s fractures” of the bones in the back of your hands, or wrists if not trained, and disciplined to throw ergonomic punches that don’t cause you to injure yourself.
Elbows, and knees, and proper foot strikes work well also.
Target your opponent’s knees at any angle of attack inside, outside, to the top, center, bottom.
If you derange, or damage a knee, weight bearing is lost, your opponent cannot attack you with that leg, or support himself to use his other leg, or rush at, or away from you.
Objectives: Degrade your opponent’s limbs from being useful against you, or defending himself.
Cause excruciating pain to dissuade his will to persist at you.
That type of thing.